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Ok, Iamb math isn't my strongest subject, so If my barrel is 4" of 2.5" pvc what lenght of 4" pvc would I use for the chamber. when I calculated it the volume of the barrel came out to be 19.56. 80% of that is 15.64 so does that mean the chamber should be 8 inches? I know I am an Idiot but It would be great if someone could tell me what I did wrong.
Ok, I did the math and I think its correct this time.For the chamber, The equation said I should use 14.94 inches of 4", if my barrel is 48 inches of 2.5". Does this seem correct to you? Thanks
Those numbers would give you a chamber/barrel ratio of 0.8 (roughly) If you are creating an over/under, remember that part of your chamber is in the elbows. Use a 12" long 4" section of pipe for your main combustion chamber. After you assemble the rest of it (elbows, reducer), measure the volume with water. Use this figure as your starting point to see what your optimal barrel length will be. You don't have to have everything glued together to gauge this, for you may consider adjusting the chamber further if you find you need a 7' barrel for optimization.
If you're 20 and not a liberal, you don't have a heart. If you're 30 and not a Conservative, you don't have a brain.
^ Well, you've been away for a bit
I think the generally accepted view is a ~0.8:1 ratio will give you the most power for a specific chamber size, and ~1.2:1 will give the most power for a specific barrel size. Though the former will be quiet and the later loud.
 
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